cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

Showing 1-3 of 3 results.

A072468 Leading diagonal of triangle in A072467.

Original entry on oeis.org

2, 5, 19, 53, 151, 211, 463, 673, 1009, 1231, 2179, 2593, 3823, 4649, 5821, 6977, 9283, 10369, 14479, 15901, 18397, 20549, 25301, 27073, 32251, 35569, 40879, 44017, 53419, 55681, 66713, 72577, 80191, 87041, 97441, 101341, 116329, 123653
Offset: 1

Views

Author

Amarnath Murthy, Jun 19 2002

Keywords

Crossrefs

Cf. A072467, A072469.

Programs

  • Mathematica
    a = {2}; k = 3; Do[i = 1; While[i < n + 1, If[ PrimeQ[k] && Mod[k, n] == 1, a = Append[a, k]; i++ ]; k++ ], {n, 2, 40}]; Table[ a[[n(n + 1)/2]], {n, 1, 40}]

Extensions

Edited by Robert G. Wilson v, Jun 28 2002

A072469 Right diagonal of triangle in A072467.

Original entry on oeis.org

2, 3, 7, 29, 61, 157, 239, 521, 739, 1021, 1277, 2221, 2731, 3851, 4651, 5857, 7039, 9343, 10831, 14561, 15919, 18481, 20563, 25321, 27551, 32371, 35803, 40993, 44371, 53551, 55987, 66721, 72733, 80207, 87151, 97453, 101603, 116471, 123787
Offset: 1

Views

Author

Amarnath Murthy, Jun 19 2002

Keywords

Crossrefs

Cf. A072467, A072468.

Programs

  • Mathematica
    a = {2}; k = 3; Do[i = 1; While[i < n + 1, If[ PrimeQ[k] && Mod[k, n] == 1, a = Append[a, k]; i++ ]; k++ ], {n, 2, 40}]; Table[ a[[n(n - 1)/2 + 1]], {n, 1, 40}]

Extensions

Edited by Robert G. Wilson v, Jun 28 2002

A072166 Triangle in which first row is {1}; to get n-th row take first n numbers greater than last number in previous row which are congruent to 1 (mod n).

Original entry on oeis.org

1, 3, 5, 7, 10, 13, 17, 21, 25, 29, 31, 36, 41, 46, 51, 55, 61, 67, 73, 79, 85, 92, 99, 106, 113, 120, 127, 134, 137, 145, 153, 161, 169, 177, 185, 193, 199, 208, 217, 226, 235, 244, 253, 262, 271, 281, 291, 301, 311, 321, 331, 341, 351, 361, 371, 375, 386, 397
Offset: 1

Views

Author

Robert G. Wilson v, Jun 28 2002

Keywords

Crossrefs

Cf. A071977 & A072467.

Programs

  • Mathematica
    a = {1}; k = 2; Do[i = 1; While[i < n + 1, If[ Mod[k, n] == 1, a = Append[a, k]; i++ ]; k++ ], {n, 2, 11}]; a
Showing 1-3 of 3 results.

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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